| 二维水平电偶极变频测深阻抗视电阻率的有限元正演计算 |
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| 引用本文： | 陈明生,严又生.二维水平电偶极变频测深阻抗视电阻率的有限元正演计算[J].地球物理学报,1987,30(2):201-208. |
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| 作者姓名： | 陈明生 严又生 |
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| 作者单位： | 1. 煤炭工业部煤炭科学院西安地质勘探分院;
2. 石油物探局解释中心, 河北涿县 |
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| 摘 要： | 在二维地电断面情况下,电偶源变频测深阻抗视电阻率的有限元计算,存在着两个困难:一个是对源的处理;另一个是边界条件的确定。本文提出了解决这两个问题的方法,构成了含源波动方程的边值问题,用有限元法求出了相应的电磁场分量,从而计算出二维地电断面的阻抗视电阻率。对各种地电断面计算的结果表明,计算方法是正确的,可对实际地电断面进行有限元模拟,求得其电磁响应。
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| 关 键 词： | 变频电磁测深 阻抗 视电阻率 有限元 |
| 收稿时间： | 1986-01-14 |
FINITE ELEMENT FORWARD SOLUTION OF TWO DIMENSIONAL FREQUENCY ELECTROMAGNETIC SOUNDING IMPEDANCE APPARENT RESISTIVITY |
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| CHEN MING-SHENG.FINITE ELEMENT FORWARD SOLUTION OF TWO DIMENSIONAL FREQUENCY ELECTROMAGNETIC SOUNDING IMPEDANCE APPARENT RESISTIVITY[J].Chinese Journal of Geophysics,1987,30(2):201-208. |
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| Authors: | CHEN MING-SHENG |
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| Institution: | 1. Institute of Geology, and Exploration, CCMRI, Ministry of Coal Industry, Xian;
2. Interpretation Center of Oil, Geophysical Exploration Bureau, Hebei, Zhuoxian |
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| Abstract: | Frequency electromagnetic sounding, by using the parameter of impedence apparent resistivity, is the same as the controlled source audio-frequency magnetotelluric (CSAMT) used in Europe and America. Proper "near-field" and "transition-field" corrections have to be performed in the calculation of the apparent resistivity. In order to avoid calculation errors, we directly carry out inversion interpretation instead of performing "near-field" correction. Two problems heed to be handled when solving the forward problem by using 2-D finite element method. The first one is the source and the second one is boundary condition. We have solved both problems and obtained good results.This paper expounds 2-D finite element forward solution in four aspects: (1) The equation for harmonicly-varying field of line source in 2-D geoelectrical medium; (2) Finite element solution of 2-D harmonic electromagnetic field equation; (3) Computation of impedance apparent resistivity; (4) Several examples, illustrating the effectiveness of the method. |
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| Keywords: | Frequecy electromagnetic sounding Impedence Apparent resistivity Finite element |
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